Buggy code:
public class Tools { public static boolean isOnline ( Context context ) { } public static void showAlertPosition ( final Context context ) { } public static boolean isPositionHardwareEnable ( Context context ) { } public static void showClosedInfoAlert ( final Context context ) { } public static String getAppName ( Context context ) { } public static void closeApp ( Context context ) { } public static boolean isCursorEmpty ( Cursor cursor ) { } public static void addThumbnail ( Context context , ImageView image , TextView text , User contact ) { } public static void addThumbnail ( Context context , ImageView image , TextView text , String name , Integer photo_id ) { } public static void addThumbnail ( Context context , ImageView photo_iv , Integer photo_id ) { } private static Bitmap fetchThumbnail ( Context context , Integer photo_id ) { } private static Bitmap getCroppedBitmap ( Bitmap bmp , int radius ) { } public static void createToast ( Context context , CharSequence text , int duration ) { } public static String getUniqueDeviceId ( Activity activity ) { } public static String getActivtyName ( Activity activity ) { } public static void setActionBar ( ActionBarActivity activity ) { } public static void resetTabActionBar ( ActionBarActivity activity ) { } public static void setUpButtonActionBar ( ActionBarActivity activity ) { } public static void resetUpButtonActionBar ( ActionBarActivity activity ) { } public static void setTitleActionBar ( ActionBarActivity activity , int id ) { } public static void setTitleActionBar ( ActionBarActivity activity , String title ) { } public static Tracker activeAnalytic ( Context context ) { } public static String removeSpace ( String input ) { } public static void closeKeyboard ( View v , Activity activity ) { } public static int getColor ( Context context , String name ) { } private static int hashFunction ( String s ) { } public static void setImageForContact ( Activity activity , TextView group_image , User contact ) { } public static void setImageForContact ( Context context , TextView group_image , String name ) { } private static String getInitial ( String name ) { } public static String getBrand ( Spinner spinner , Activity activity ) { } public static int getBrandIndex ( String brand , Activity activity ) { } public static String getTimestamp ( ) { } public static boolean isBluetoothEnable ( ) { } public static void showAlertBluetooth ( final Context context ) { } public static void invalidDB ( MainActivity activity ) { } public static void showAlertBluetoothJoin ( final Context context , final EditCar fragment , final String bluetooth_name , final String bluetooth_mac , final Car car , final Button button ) { } public static void showAlertBluetoothRemove ( final Context context , final EditCar fragment , final Car car ) { } public static double [ ] getPosition ( Context context ) { } private static double [ ] getLocationGPS ( LocationService locationService ) { } private static double [ ] getLocationNetwork ( LocationService locationService ) { } public static void sendNotification ( Context context , String name , String type ) { } public static SQLiteDatabase getDB_Readable ( Context context ) { } public static SQLiteDatabase getDB_Writable ( Context context ) { } public static String getPhotoID_byEmail ( Context context , String email ) { } public static void manageServerError ( final Result result , final MainActivity activity ) { } public static String getIntervalDataServer ( String data ) { } public static AlertDialog showAlertParking ( final MainActivity activity , ArrayList < Car > cars , User user ) { AlertDialog . Builder alertDialog = new AlertDialog . Builder ( activity ) ; alertDialog . setCancelable ( false ) ; alertDialog . setTitle ( "Pick<seq2seq4repair_space>the<seq2seq4repair_space>car" ) ; alertDialog . setAdapter ( new it . familiyparking . app . adapter . CustomAdapterCarDialog ( activity , cars , user ) , null ) ; alertDialog . setNegativeButton ( "Cancel" , new DialogInterface . OnClickListener ( ) { public void onClick ( DialogInterface dialog , int which ) { dialog . cancel ( ) ; } } ) ; AlertDialog alertDialogClass = alertDialog . create ( ) ; <START_BUG> alertDialog . show ( ) ; <END_BUG> return alertDialogClass ; } public static String getFormatedData ( String allInfo ) { } }

Fix:
alertDialogClass . show ( ) ;